比較狀語從句。首先大家必須搞清楚狀語從句，從本質(zhì)上講，狀語從句就是用連詞將幾個(gè)分句連接起來，用來表達(dá)分句之間特定的邏輯關(guān)系。來看一個(gè)例句：

　　【例句】George Annas, chair of the health law department at Boston University, maintains that, as long as a doctor prescribes a drug for a legitimate medical purpose, the doctor has done nothing illegal even if the patient uses the drug to hasten death. “It’s like surgery,” he says. “We don’t call those deaths homicides because the doctors didn’t intend to kill their patients, although they risked their death. If you’re a physician, you can risk your patients’ suicide as long as you don’t intend their suicide.”

　　【解析】句中共有6個(gè)連接詞，即含有6個(gè)狀語從句，其中as long as，if是引導(dǎo)條件狀語從句;even if，although是引導(dǎo)讓步狀語從句;because引導(dǎo)原因狀語從句。所以說，狀語從句在長難句中的出現(xiàn)頻率很高，需要特別重視學(xué)習(xí)。

　　【參考譯文】波士頓大學(xué)健康法律系主任喬治·安納斯認(rèn)為，只要醫(yī)生是出于合理的醫(yī)療目的開藥，縱然服用此藥后會(huì)加速病人的死亡，醫(yī)生是無罪的。他說：“這就像做手術(shù)，我們不能把死亡稱作謀殺，因?yàn)獒t(yī)生并沒有想殺死病人，盡管他們冒著死亡的危險(xiǎn)。如果你是一名醫(yī)生，只要你沒有想讓病人自殺，你就能冒你的病人自殺的危險(xiǎn)。”

 
    常用引導(dǎo)詞：as（同級比較）， than（不同程度的比較）
　　特殊引導(dǎo)詞：the more … the more … ; just as …， so…;
　　A is to B what /as X is to Y; no … more than; not A so much as B
　　She is as bad-tempered as her mother.
　　她和她媽一樣脾氣暴躁。
　　The house is three times as big as ours.
　　這所房子是我們的三倍大。
　　The more you exercise， the healthier you will be.
　　越鍛煉你就越健康。
　　Food is to men what oil is to machine.
　　食物之于人，猶如油之于機(jī)器。